Charles H. Spurgeon on Psalms 102:5

By reason of the voice of my groaning my bones cleave to my skin. He became emaciated with sorrow. He had groaned himself down to a living skeleton, and so in his bodily appearance was the more like the smoke-dried, withered, burnt-up things to which he had previously compared himself. It will be a very long time before the distresses of the church of God make some Christians shrivel into anatomies, but this good man was so moved with sympathy for Zion's ills that he was wasted down to skin and bone.